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Nanocellulose is attracting more and more interests as a nanoscale 1D additive in polymeric membranes due to its natural availability, high aspect ratio, tunable surface, and excellent mechanical properties. In this work, an effective way to modify nanocellulose fibril surfaces for performance enhancement in CO2 separation membranes has been demonstrated. The functionalization promptly triggered intrinsic property responses in favour of nanofiber dispersion and CO2 transport. Thin composite membranes containing the modified nanofibers in water-swelling polyvinyl alcohol (PVA) as well as in the blend of sterically-hindered polyallylamine (SHPAA) and PVA were fabricated and tested using humid gas permeation tests. Defect-free ultrathin (300 nm) hybrid selective layers containing evenly distributed nanofibers were successfully coated. The addition of nanocellulose exhibited enhanced CO2 permeance and CO2/N2 selectivity compared to the neat PVA membranes; CO2 permeance up to 652 GPU with a CO2/N2 selectivity of 41.3 were documented. Functionalization plays a clear role in the dispersion of nanocellulose fibrils in the SHPAA/PVA blend, increasing the steric stabilization and interface compatibility with the polymer matrix. The tuned interface with PEG groups act as sites for water clusters retention and increased CO2 solubility, thus creating fast diffusion pathways for CO2 transport.
This article was published in the following journal.
Name: ACS applied materials & interfaces
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Screening techniques first developed in yeast to identify genes encoding interacting proteins. Variations are used to evaluate interplay between proteins and other molecules. Two-hybrid techniques refer to analysis for protein-protein interactions, one-hybrid for DNA-protein interactions, three-hybrid interactions for RNA-protein interactions or ligand-based interactions. Reverse n-hybrid techniques refer to analysis for mutations or other small molecules that dissociate known interactions.
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Membrane proteins whose primary function is to facilitate the transport of molecules across a biological membrane. Included in this broad category are proteins involved in active transport (BIOLOGICAL TRANSPORT, ACTIVE), facilitated transport and ION CHANNELS.
The movement of ions across energy-transducing cell membranes. Transport can be active, passive or facilitated. Ions may travel by themselves (uniport), or as a group of two or more ions in the same (symport) or opposite (antiport) directions.
The passive movement of molecules exceeding the rate expected by simple diffusion. No energy is expended in the process. It is achieved by the introduction of passively diffusing molecules to an enviroment or path that is more favorable to the movement of those molecules. Examples of facilitated diffusion are passive transport of hydrophilic substances across a lipid membrane through hydrophilic pores that traverse the membrane, and the sliding of a DNA BINDING PROTEIN along a strand of DNA.